Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se
Reexamination Certificate
2007-12-11
2007-12-11
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
C336S229000
Reexamination Certificate
active
11562005
ABSTRACT:
The AC detection coil is a toroidal coil and includes plural radial-line conductors which are formed on a front face and a rear face of a substrate, conductive connection parts and conductive through-holes which connect electrically each end of radial-line conductors, wherein plural winding turns are consecutively formed by a connection of each radial-line conductor on the front and the rear faces, respectively, and include a forward coil and a backward coil, and each shape on the front and the rear faces of the radial-line conductors and the conductive connection parts are identical with each other. Consequently, when seen from a thickness direction of the substrate, areas of the forward coil and the backward coil are equal to each other, and an external, unneeded to be detected, magnetic field can be canceled each other by the forward coil and the backward coil, then a current detection accuracy can be improved.
REFERENCES:
patent: 5414400 (1995-05-01), Gris et al.
patent: 6313623 (2001-11-01), Kojovic et al.
patent: 6822547 (2004-11-01), Saito et al.
patent: 6909279 (2005-06-01), Niwa
patent: 7106162 (2006-09-01), Saito
patent: 6-176947 (1994-06-01), None
patent: 2004-087619 (2004-03-01), None
English language Abstract of JP 6-176947.
English language Abstract of JP 2004-087619.
Ichimura Yasuo
Ishibashi Akihiro
Iwami Eiji
Shiokawa Akimi
Yoshimura Kazunari
Greenblum & Bernstein P.L.C.
Matsushita Electric & Works Ltd.
Nguyen Hoai-An D.
Nguyen Vincent Q.
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